Theres no other way to flip these cards
It doesnt take much to turn an overloaded Rift into a win, especially since your non-green opponents need to rebuild their mana and creatures
If you stick solely to Vampire Aristocrats like the precon promotes then I think Clavileno and Carmen are about the same power level where it boils down your own preferences and your own meta: Clavileno is cheaper and provides a slow but consistent payoff, whereas Carmen is more expensive but also more explosive and randomly becomes more powerful if you happen to play against decks that sacrifice a lot (fetchlands, treasures, other Aristocrats etc.)
That means they generally have an eye more toward fitting into Edge of Eternities' draft and sealed formats (which only use cards from this single set) rather than making waves in constructed formats like Standard or Commander
The combination of mana to accelerate big equipment like Argentum Armor and Kaldra Compleat plus the ability to equip them for free sounds like a winning combination, especially with ward
Zirilan of the Claw MTG Zirilan of the Claws applications are a bit more on the nose, but its no less powerful